- 'Synthetic chemical' substance blamed for mass death of fish in Oder river in Germany and Poland as investigations continue ABC News
- Dead fish in River Oder spur contamination probe Reuters
- Poland investigates 'ecological catastrophe' of fish die-off The Washington Post
- Germany and Poland search for cause of mass fish die-off in river Oder Reuters
- Dead fish in River Oder on Polish-German border spur contamination probe Reuters
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